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You define the convertToCaloriesWith:
method in basically the same way that you learned to define the
fatToCalories method in Chapter 4. The only difference is
the addition of a parameter:
Integer method definition • instance convertToCaloriesWith: caloriesPerGram ^ self * caloriesPerGram
The following diagram shows what each part of the method definition does:
*-- The method selector
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| *-- The method's parameter
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v v
---------------------- ---------------
convertToCaloriesWith: caloriesPerGram
^ self * caloriesPerGram
^ ----------------------
| ^
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| *-- An expression to be evaluated
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*-- Answer marker